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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^6*((18*x^-11*y^20)/28)*y^-11 = 0
9/14*x^-5*y^9 = 0 // : 9/14*y^9
x^-5 = 0
x należy do O
x belongs to the empty set
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